JP2606588Y2 - Double writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the provision of a double-type writing instrument in which the tips of a plurality of writing bodies are made to be able to come and go alternately at a tip end of a front shaft and an eraser is made to come and go from the rear end of a cap.

[0002]

2. Description of the Related Art Conventionally, as an example of a double-type writing instrument, as shown in Japanese Utility Model Application Laid-Open No. 64-3491 by the same applicant, a sliding groove for guiding two writing objects is provided on a front shaft. The front end has a guide tube fixed to the guide tube and a cam slope contacting a sliding piece attached to two writing bodies fitted to the guide tube, and the rear end forms a knock portion to the cap. Equipped with a cylindrical cam mounted so as to be movable in the axial direction and integrated in the circumferential direction, and by selectively rotating the cap with respect to the front shaft, two writing bodies can be selectively placed at the front end of the front shaft. There are multiple writing instruments that can appear and disappear.
Further, as a cited example of the present application, there is a double writing instrument in which an eraser is made to protrude and disappear by rotating a crown protruding from the rear end of a cap as seen in Japanese Utility Model Application Laid-Open No. 60-120889 by the present applicant. .

[0003]

The above cited reference has a first problem in that metal parts are used in many parts, the structure is complicated, the number of parts is increased, and the cost is increased. or,
Since the crown that protrudes from the rear end of the cap is short, there is a second problem in that it is difficult to pick with a finger, and it is difficult to operate the eraser in and out.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a double writing instrument according to the present invention has a front end made of a resin and a front end made of a middle shaft made of a resin fitted to each other so as to be non-rotatable and non-removable. A pair of writing elements such as a ballpoint pen with a sliding piece fastened to the rear end of the guide cylinder are slid in the multiple guide grooves of the guide cylinder integrated with the center shaft. A return spring is provided between the top and the top to urge each writing body to the rear, and each of the writing implements is fitted so as to be able to move back and forth in the axial direction. A substantially inverted T-shaped window is formed by connecting the grooves at a narrow portion,
Also, a projection is provided on the side surface of a cylindrical cam having a cam inclined surface displaced in the axial direction provided at the front end portion in a circumferential shape, and the projection is elastically fitted into the peripheral groove through the vertical groove to form a guide cylinder and a center shaft. On the other hand, the cylindrical cam is prevented from being rotatable within a certain range, and each sliding piece is brought into contact with the cam slope of the cylindrical cam. By moving them alternately, the tip of each cursive body can be selectively protruded and retracted from the tip of the tip of the spindle, and an eraser holder with an eraser fixed in a cap of appropriate length is provided extending behind the cylindrical cam. In addition, the eraser holder is moved back and forth with respect to the cap so that the eraser can be made to come and go through the rear end hole of the cap. As described above, since the dual writing instrument of the present application has a simplified number of parts and a simple structure, the assembly is easy and the cost can be reduced. Further, the operation of feeding the eraser is easy.

[0005]

1 and 2 show a first embodiment of the present invention. The double-type writing instrument of this embodiment has a center shaft 1 integrally provided with a guide cylinder 2, a front shaft 3, a cap 4 integrally provided with a cylindrical cam 5, a pair of sliding pieces 6, 6 ｀, and a writing body 7, 7 such as a ballpoint pen. (4) The eraser holder 29 and the eraser 40 are main components. First, the center shaft 1 is made of resin, and as shown in FIG. 1, an axially long guide groove 8 opened to the side surface from a substantially central portion to a rear end and a similar guide groove 8 ｀ on the opposite side surface.
Is provided. Guide tube 2
In the front half of each of the holes 24, 2
A cylindrical portion 9 having a partition portion 14 having a 4 ° angle and having an open front end is provided, and a step portion 23 is provided at a rear end of the cylindrical portion 9 to form a step portion 2.
A bulging engagement portion 11 is formed on the front outer peripheral portion of 3.

On the rear side surface of the center shaft 1, a vertical groove 16 is connected to a circumferential groove 17 through a slant surface 34 at the front, as shown in FIG. The part is perforated. As will be described later, the projection 15 of the cylindrical cam 5 is inserted from the vertical groove 16, the projection 15 elastically expands the inclined surface 34, passes through the narrow portion 35, and is defined by the rear wall 36 and the front wall 37. Into the circumferential groove 17. The cylindrical cam 5 rotates within a range in which the projection 15 abuts on both circumferential walls of the circumferential groove 17, and the writing tips of the writing bodies 7, 7 等, such as a ballpoint pen, alternately protrude and retract from the tip of the front shaft. .

[0007] The front end of the shaft 3 is tapered, and is provided with a distal end opening at the distal end of the inner hole, through which the writing distal end appears and disappears. In the rear end hole, an engagement groove 10 is provided, which engages with an engagement portion 11 provided on the outer peripheral portion of the cylindrical portion 9 of the guide cylinder, and prevents the cylindrical portion 9 from slipping out and rotating. . In addition, the cylindrical portion 9 and the front shaft 3
Is detachably fixed by an appropriate force. (The actual opening 64-3
(Same as the configuration of the front shaft in JP 491)

The cap 4 is made of resin and has a cylindrical cam 5 at the tip.
Are integrally provided. The cylindrical cam 5 has a cylindrical shape, and has a cam slope 12 that is displaced circumferentially back and forth at a front end edge, and a notch 13 is formed at the foremost end of the cam slope 12. or,
On the side surface of the cylindrical cam 5, there is formed a projection 15 which is inserted into the vertical groove 16 of the center shaft 1, elastically fits into the circumferential groove 17, and rotates and prevents it from falling out within a certain range (approximately 180 degrees).

The cap 4 has a cylindrical portion extending behind the cylindrical cam 5, and a slit 2 is provided on a side surface of the cylindrical portion.
5 are formed, and a projection 26 and a groove 2 are provided on both sides of the slit 25.
7 are provided alternately in a plurality of rows. Further, an eraser holder 29 having an eraser 40 fixed to the rear end of the cylindrical portion is provided with an engaging projection 32 provided on the outer periphery thereof.
It is attached so that it can be engaged and disengaged. Engaging projection 3
Numeral 2 is formed at the tip of an elastic piece provided on the side surface of the eraser holder 29, and engages while elastically displacing with the groove 27 while sliding to keep the eraser 40 in the projected state. The center of the engaging projection 32 is slightly protruded to form the operation button 33, and the eraser holder 29 can be moved while releasing the engagement between the engaging projection 32 and the groove 27 by moving the operation button 33 back and forth. And A crown 28 is fixed to the rear end of the cylindrical portion.
Note that the rear end portion 38 of the cylindrical portion and the contact portion 39 of the crown 28 form a slope and are substantially in contact with each other, thereby suppressing deformation of the rear end of the slit 25.

The sliding piece 6 has a projection 20 on its outer surface.
The rear end surface of the projection 20 has a central portion projecting, and both sides thereof have cam slopes having substantially the same slope as the cam slope 12 of the cylindrical cam 5 described above. A locking portion 21 for fixing the rear end of the writing body 7 such as a ball-point pen is provided at the tip. A sliding piece 6 # is also provided in the same manner as the sliding piece 6, and a rear end of a writing body 7 # such as a ballpoint pen is fixed to the locking portion 21 #.

Next, a description will be given of the order of assembly. Writing bodies 7 and 7 # such as ball-point pens are connected with respective sliding pieces 6 and 6 # at the rear ends thereof, so that the respective guide grooves 8 of the above-mentioned center axis guide cylinder 2 are formed. , 8 ｀
, And are urged rearward by return springs 22, 22 # interposed between the front end faces of the sliding pieces 6, 6 # and the guide grooves 8, 8 # the partition 14 on the front face. You. The cap 4 inserts the cylindrical cam 5 into the rear end hole of the center shaft 1 so that the projection 15 is elastically fitted into the circumferential groove 17, and is rotatable about 180 degrees in the circumferential direction with respect to the center shaft 1 and is prevented from coming off. Is stopped. Also, since the sliding pieces 6, 6 # are constantly urged rearward by the return springs 22, 22 #, the cam slopes of the projections 20, 20 # always contact the cam slope 12 of the cylindrical cam 5. Is kept.

The engaging portion 11 of the cylindrical portion 9 is elastically fitted in the engaging groove 10 of the front shaft 3 with the rear end surface of the front shaft 3 in contact with the front surface of the step portion 23 of the center shaft 1. Thus, the front shaft 3 and the center shaft 1 are fixed in a state where rotation is prevented and the shaft is prevented from coming off. The tip shaft 3 is detachable with an appropriate force. In this state, when the cap 4 is rotated to one side with respect to the front shaft 3 or the center shaft 1, the sliding piece 6
Is notched 1 at the forefront end of the cam slope 12 of the cylindrical cam 5
Reference numeral 3 denotes a projection 2 of a sliding piece 6 of a writing body 7 such as a ballpoint pen.
0 and the writing tip projects from the tip end of the front shaft. When the cap 4 is rotated in the other direction with respect to the front shaft 3 or the center shaft 1, the sliding piece 6 is retracted so that the writing tip of the writing body 7 such as a ball-point pen is immersed from the tip of the tip shaft. ｀ advances, and the writing tip of the other writing body 7 等 such as a ballpoint pen projects from the front end of the front shaft.

On the other hand, an eraser holder 29 is fitted from the rear end of the cylindrical portion of the cap 4, and the engaging projections 32 of the eraser holder 29 are engaged with the grooves 27 of the slit 25 provided in the cylindrical portion. Are slidable with respect to the cylindrical portion. The crown 28 is fixed to the rear end of the cylindrical portion, and the eraser 40 is inserted through the opening at the rear end of the crown 28, and the rear end of the eraser 40 is fixed to the eraser holder 29.
As described above, when the eraser holder 29 is moved back and forth, the eraser 40 comes out of the opening of the crown 28. The inner diameter of the opening of the crown 28 is provided slightly larger than the outer diameter of the eraser 40.

FIGS. 3 and 4 show a second embodiment of the present invention. Since this embodiment has many components in common with the above-described first embodiment, only the differences will be described below. First, as shown in FIG. 4, a substantially inverted T-shaped window is formed in the rear side surface of the center shaft 1 #. Protrusions 38 # and 39 # are formed on the rear wall 36 # of the circumferential groove 17 # at appropriate positions sandwiching the narrow portion 35. The distance between the rear wall 36 # and the front wall 37 # is set to be slightly larger than the projection size of the projections 38 # and 39 # with respect to the axial width of the projection 15 of the cylindrical cam.

The cap 4 # is made of resin, has a cutout on the side surface on the front side, and is provided with a button 29 # that can be displaced inward.
Inside the button 29 #, there is a cylindrical portion 26 # of a cylindrical cam 5 # described later.
Is formed with a pressing portion 30 # which is engaged by pressing.
It is to be noted that an uneven portion or the like can be appropriately formed between contact portions of the cylindrical portion and the push portion. Also, a groove 28 is formed in the inner hole from the front.
A spiral groove 27 # is formed behind the concave groove 28 #, and a rear end hole 35 # is provided with an inclined contact portion 34 # at the rear end of the spiral groove 27 #. .

The cylindrical cam 5 # has a cylindrical portion 26 # extending rearward, and the cylindrical portion 26 # substantially abuts the contact portion 34 # of the cap 4 # together with a hole through which the eraser 42 is inserted. It also has a slanted rear end 25 ° which is in contact with it, and a flange 18 ° and a slit 19 ° which is long toward the rear end 25 ° on the outer periphery.
Are drilled. Further, the eraser holder 31 # has a pair of elastic pieces 40 # that sandwich the rear end of the eraser 42 at the rear and a locking projection 41 that appropriately cuts into the outer surface of the eraser 42 on its inner surface. Elastic piece 4 on the side of ｀
A pair of protrusions 33 ° are provided coaxially with 0 °.
The reason why the rear end portion 25 # of the cylindrical portion 26 # and the contact portion 34 # of the cap 4 # are inclined and substantially in contact with each other is to suppress deformation of the rear end of the slit 19 #. is there.

In the assembling sequence, an eraser holder 31 # is inserted from the rear end of the cylindrical portion 26 # of the cylindrical cam 5 #, and the projection 33 # and the elastic piece 40 # are fitted into the slit 19 #, and the eraser holder is inserted. An eraser 42 is fixed to the rear end of the cap 31. The cap 4 # is inserted into the cylindrical part 26 # from the front end, and the flange 18 # is elastically deformed to form the groove 2 of the cap.
Fit into 8mm. In addition, the front end of the eraser holder 31 # is in contact with the step of the front end of the slit 19 # and the projection 33
｀ is inserted into the spiral groove 27 ｀. (More precisely, the cylinder 2
By slightly rotating the cap 4 ° with respect to 6 °, the projection and the spiral groove are engaged. ) As described above, the cylindrical portion 26 ° becomes the rear end portion 25 °.
While being substantially in contact with the contact portion 34 # of the cap 4 #, the cap 4 # is rotatably stopped against the cap 4 #. In addition, the cylindrical portion 26 # having the slit 19 # is delicate and easily deformed,
The inward deformation is prevented by the engagement between the inclined rear end portion 25 ° and the abutting portion 34 °, so that it is stabilized after mounting.

[0018]

In the first embodiment, when the cap 4 is rotated in one direction with respect to the front shaft 3 or the center shaft 1, the notch 13 provided at the tip of the cam slope 12 of the cylindrical cam 5 as shown in FIG. The writing tip of the writing body 7 such as a ballpoint pen is engaged with the sliding piece 6 to protrude from the tip end of the front shaft. When the cap 4 is rotated to the other end with respect to the front shaft 3 or the center shaft 1, the writing body 7 such as a ball-point pen retreats, and the writing tip of the writing body 7 # such as a ball-point pen protrudes from the tip end of the front shaft.

Next, when the operation button 33 of the eraser holder 29 is pressed and retracted with respect to the cap 4, the engagement projection 32
Is moved away from the groove 27 of the slit 25, the eraser holder 29 is gradually retracted, and the eraser 40 is fed out from the opening of the crown 28. When the operation button 33 is pushed forward, the eraser holder 29 advances, and at the same time, the eraser 40 is immersed through the opening of the crown 28.

In the second embodiment, when the cap 29 is pressed against the front shaft 3 or the center shaft 1 while the button 29 is pressed to the front shaft side while the button 29 is pressed, the cap 29 is rotated to one side. Engages with the side surface of the cylindrical portion 26 #, whereby the cylindrical cam 5 # and the cap 4 # are integrated in the rotational direction, and as shown in Fig. 4, the projection 15 comes into contact with the front wall 37 #. The state in which the rotation of the projection 38 # with respect to the projection 15 is stopped is released.) As shown in FIG. 3, the writing tip of the writing body 7 such as a ballpoint pen projects from the tip end of the front shaft. In addition, cap 4 ｀
When writing is rotated to the other side, the writing body 7 such as a ball-point pen retreats, and instead the writing tip of the writing body 7 # such as a ball-point pen projects from the front end of the front shaft.

Next, when the cap 4 # (the button 29 # is not pressed) is rotated with respect to the front shaft 3 or the center shaft 1 #, the eraser 42 comes out of the rear end hole 35 # of the cap. Also, at this time, as shown in FIG.
As a result, the cylindrical cam 5 # is fixed to the center shaft 1 #, and the cap 4 # rotates.

In the second embodiment, a suitable frictional resistance is provided between the cylindrical portion 26 # and the cap 4 #, and the frictional resistance moves the sliding pieces 6, 6 # back and forth. Cylindrical cam 5 ｀
If the rotation resistance is larger than the above, the button 29 # becomes unnecessary. Further, the cylindrical cam 5 # is provided with a return spring 22,
Since the sliding pieces 6, 6 # and the notch 13 are engaged with each other via 22 # and have appropriate rotation resistance, the rotation resistance is
If the rotational resistance between the cylindrical portion 26 # and the cap 4 # in a state where the 9 # is not pressed is made larger, the above-mentioned protrusions 38 # 39 # become unnecessary. However, considering the variation in design, it is desirable to provide the button 29 # and the protrusions 38 #, 39 #.

[0023]

As described above, according to the present invention, the center shaft integrally provided with the leading shaft and the guide portion is formed as a resin molded product, and the protrusion provided on the side surface of the cylindrical cam is elastically provided in the circumferential groove formed in the rear of the center shaft. In addition, since the engaging portion for joining the front shaft and the cap is integrally provided on the center shaft, the number of parts is reduced with respect to the conventional dual writing implement, the structure is simplified, and the assembling is simplified. It becomes easy and cost reduction is achieved. In addition, an eraser holder with an eraser fastened to the inner hole of a suitably long resin cap extending behind the cylindrical cam is provided, and the eraser can move out of the rear end of the cap by moving the eraser holder back and forth. With this configuration, the metal parts are replaced with resin as compared with the conventional cited example, and the number of parts is reduced. Also, since the assembly is easy, the cost can be reduced and the product can be provided at low cost. Further, the operability of feeding the eraser is good. In particular, the combination with a writing pen such as a ballpoint pen that can be erased with an eraser exerts further convenience.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view of the entire main part showing a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an engagement state between a cylindrical cam and a center shaft in FIG. 1;

FIG. 3 is a longitudinal sectional view of the entire main part showing a second embodiment of the present invention.

FIG. 4 is an explanatory view showing an engagement state between a cylindrical cam and a center shaft in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Middle shaft 1 ｀ Middle shaft 2 Guide cylinder 3 Front shaft 4 Cap 4 ｀ Cap 5 Cylindrical cam 5 ｀ Cylindrical cam 6 Sliding piece 6 ｀ Sliding piece 7 Writing body such as ballpoint pen 7 ｀ Writing body such as ballpoint pen 8 Guide groove 8 ｀ Guide groove 9 Cylinder part 10 Engagement groove 11 Engagement part 12 Cam slope 13 Notch 14 Partition part 15 Projection 16 Vertical groove 17 Peripheral groove 17 ｀ Peripheral groove 18 Wall 18 ｀ Flange 19 Window 19 ｀ Slit 20 Projection 20 ｀ Projection 21 Engagement Part 21 ｀ Locking part 22 Return spring 22 ｀ Return spring 23 Step part 24 Hole 24 孔 Hole 25 Slit 25 後 Rear end part 26 Projection 26 ｀ Tube part 27 Groove 27 ｀ Spiral groove 28 Crown 28 ｀ Concave groove 29 Eraser holder 29 ｀ button 30 fitting section 30 ｀ pushing section 31 elastic piece 31 ｀ eraser holder 32 engaging projection 32 ｀ cylinder section 33 operation button 33 筒 projection 34 inclined surface 34 ｀ contact portion 35 narrow portion 35 ｀ rear end hole 36 rear wall 36 ｀ rear wall 37 front wall 37 ｀ front wall 38 rear end 38 ｀ protrusion 39 contact portion 39 ｀ protrusion 40 eraser 40 ｀ Elastic piece 41 Locking projection 42 Eraser

Claims (1)

(57) [Scope of request for utility model registration] A plurality of guide cylinders integrated with a center shaft are provided by providing engaging portions for fitting the front end of the resin shaft and the center shaft of the resin in a non-rotatable and non-removable state. In the guide groove, a plurality of writing bodies such as ballpoint pens with sliding pieces fixed to the rear end are provided with a return spring between the guide cylinder and the sliding pieces to urge each writing body backward, In the compound writing instrument which is fitted so as to be able to move back and forth in the direction, a substantially inverted T-shaped window portion is formed in the rear side surface of the center shaft, in which the vertical groove and the circumferential groove are connected by a narrow portion, and A projection is provided on a side surface of a cylindrical cam having a cam inclined surface displaced in the axial direction provided circumferentially at a front end portion, and the projection is elastically fitted into the peripheral groove through the vertical groove so that the guide cylinder and the center shaft are The cylindrical cam is locked so that it can rotate within a certain range, and each sliding piece touches the cam slope of the cylindrical cam. By contacting, the sliding pieces are alternately moved in the front-rear direction by the rotation of the cylindrical cam with respect to the front shaft or the center shaft so that the tip of each writing body can be selectively protruded and retracted from the front shaft tip opening, and the rear of the cylindrical cam. An eraser holder with an eraser fastened is provided in a cap of an appropriate length that is extended and provided at the same time, and the eraser holder is moved back and forth with respect to the cap so that the eraser can freely come out of the rear end hole of the cap. A dual-purpose writing instrument characterized by the following.